Meanings of superb vitality in English

He let the young man's superb vitality work the inevitable and speedy cure.

I suppose it's her superb vitality that attracts him.

Now that his fever had left him, his superb vitality was asserting itself once more, and he rallied quickly.

From her abounding life and superb vitality he drew unconscious strength; the hidden forces that defy analysis once more exerted themselves in his behalf.